How many software solutions does your SaaS start-up rely on?

During the course of idea validation interviews we found that most early stage SaaS businesses rely on 6-7 point solutions across categories like lead capture, email marketing, subscription billing, CRM, and reporting tools. More on our findings if interested here.

Is the integration and ongoing maintenance of these tools painful for your SaaS start-up? I'd love any feedback on what's worked well for your early stage SaaS business, and what's been painful as you consider the initial software tools your business relies on.